I understand where “that which restrains is no more” is interpreted. It is a long stretch to say there will be believers in the trib and no Holy Spirit indwelling those believers. We need a bit more scriptures than that one reference to come to such a bold conclusion.
A sure fire way to determine if this is the case is to expound on the Gospel the two witnesses will preach as well as the 144,000 sealed of Israel. If we say they bring a different gospel than the NT then we put ourselves in the error of the Mormons and others.
I tend to not let eschatology drive Soteriology.
John the baptist baptized with water...Jesus Christ baptizes with the Holy Ghost...That was a mystery up until it was revealed to Paul by the Risen Savior...
Rom_16:25 Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,
Eph_3:4 Whereby, when ye read, ye may understand my knowledge in the mystery of Christ)
Eph_3:9 And to make all men see what is the fellowship of the mystery, which from the beginning of the world hath been hid in God, who created all things by Jesus Christ:
Eph_5:32 This is a great mystery: but I speak concerning Christ and the church.
Col_1:27 To whom God would make known what is the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory:
There were incidents of the Holy Spirit landing on people prior to that but the indwelling of the Spirit wasn't revealed until Paul...
After the Holy Spirit leaves with the church in the Rapture, Jesus takes up where he left off in the Gospels prior to the giving of the Holy Spirit offering the physical Kingdom of Heaven for his original chosen people...
Not really. In the Old Testament the Israelites did not have the indwelling of the Holy Spirit as we do today. That indwelling didn’t happen until after Christ ascended. The Holy Spirit did speak to them. Remember that God is dealing with the Israelites during that seven year period just as He did prior to Christ’s death, resurrection and ascension. It can’t be grace and law.